http://api.tweetmeme.com/imagebutton.gif?url=http://espn.go.com/los-angeles/nba/story/_/id/8137212/blake-griffin-says-feels-positive-future-los-angeles-clippers (http://api.tweetmeme.com/share?url=http://espn.go.com/los-angeles/nba/story/_/id/8137212/blake-griffin-says-feels-positive-future-los-angeles-clippers&service=bit.ly&source=espn)Blake Griffin can't sign an extension with the Los Angeles Clippers until July 11. But Griffin was already talking like a man ready to build a future in L.A. Friday afternoon after Team USA's first practice in Las Vegas.